> > expecting the network > > to isolate insecure hosts from untrustworthy attackers, or more > > generally, to enforce policy about what kinds of content are > > permitted to pass, has always been a stretch. > > > > So where do firewalls fit into your picture? Do they represent for the > network or for the hosts? I believe the primary purpose of firewalls should be to protect the network, not the hosts, from abusive or unauthorized usage.